Key singer runs, catching a non-stop flight (9)
I believe the answer is:
escalator
'flight' is the definition.
(I have seen 'nonstop flight' mean 'escalator' so perhaps 'flight' could also mean 'escalator')
'key singer runs catching a non-stop' is the wordplay.
I cannot really understand how this works, but
'key' could be 'e' (musical key) and 'e' is found in the answer.
'runs' could be 'r' (cricket abbreviation) and 'r' is found within the answer.
'a' is present in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for escalator that I've seen before include "effortless steps" , "financial clause" , "Lift" , "the easy way up" , "Moving stairway" .)